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《Well Logging Technology》 1992-01
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The Physical Mechanism of Head Waves in Acoustic Well Logging

Yu Shoumian  
It is proved that the head waves are of nonlinear effects of the elastic wave equations. The analytic expressions of the equations are obtained under the condition that the media inside and outside a borehole are perfect elastic. It is illustrated that head waves are of a resonant mode and have no axial geometrical attenuation and that geomitical acoustics is not applicable to well logging and that the concept of "critical refracted arrival" is fictitious.
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